You are never too old to set another goal or to dream a new dream.

Aim at heaven and you will get earth thrown in.
 Aim at earth and you get neither.~ C. S. Lewis

“Your real, new self (which is Christ's and also yours, and yours just because it is His) will not come as long as you are looking for it. It will come when you are looking for Him. Does that sound strange? The same principle holds, you know, for more everyday matters. Even in social life, you will never make a good impression on other people until you stop thinking about what sort of impression you are making. Even in literature and art, no man who bothers about originality will ever be original whereas if you simply try to tell the truth (without caring two pence how often it has been told before) you will, nine times out of ten, become original without ever having noticed it. The principle runs through all life from top to bottom, Give up yourself, and you will find your real self. Lose your life and you will save it. Submit to death, death of your ambitions and favorite wishes every day and death of your whole body in the end submit with every fiber of your being, and you will find eternal life. Keep back nothing. Nothing that you have not given away will be really yours. Nothing in you that has not died will ever be raised from the dead. Look for yourself, and you will find in the long run only hatred, loneliness, despair, rage, ruin, and decay. But look for Christ and you will find Him, and with Him everything else thrown in.” ― C.S. Lewis, Mere Christianity^[a]

Clive Staples Lewis ( 1898 – 1963 ), commonly called C. S. Lewis and known to his friends and family as "Jack", was a novelist, poet, academic, medievalist, literary critic, essayist, lay theologian, and Christian apologist born in Belfast, Ireland. Lewis and fellow novelist J. R. R. Tolkien were close friends.
Lewis was raised in a church-going family in the Church of Ireland. He became an atheist at 15, though he later described his young self as being paradoxically "very angry with God for not existing". His early separation from Christianity began when he started to view his religion as a chore and as a duty; around this time, he also gained an interest in the occult, as his studies expanded to include such topics.
Lewis's interest in the works of George MacDonald was part of what turned him from atheism. He slowly re-embraced Christianity, influenced by arguments with his Oxford colleague and friend J. R. R. Tolkien, and by the book The Everlasting Man by G. K. Chesterton. He fought greatly up to the moment of his conversion, noting that he was brought into Christianity like a prodigal, "kicking, struggling, resentful, and darting his eyes in every direction for a chance to escape." After his conversion to theism in 1929, Lewis converted to Christianity in 1931, following a long discussion and late-night walk with his close friends Tolkien and Hugo Dyson.
His first novel after becoming a Christian was The Pilgrim's Regress (1933), which depicted his experience with Christianity in the style of John Bunyan's The Pilgrim's Progress. Lewis continues to attract a wide readership.
[a]Mere Christianity is a theological book by C. S. Lewis, adapted from a series of BBC radio talks made between 1942 and 1944, while Lewis was at Oxford during World War II. Considered a classic of Christian apologetics, the transcripts of the broadcasts originally appeared in print as three separate pamphlets: The Case for Christianity (1942), Christian Behaviour (1943), and Beyond Personality (1944). Lewis was invited to give the talks by Rev. James Welch, the BBC Director of Religious Broadcasting, who had read his 1940 book, The Problem of Pain^[1].
[1].The Problem of Pain is a 1940 book by C. S. Lewis in which he seeks to provide an intellectual Christian response to questions about suffering. The book is a theodicy, an attempt by one Christian layman to reconcile orthodox Christian belief in a just, loving and omnipotent God with pain and suffering.
Some have felt that it is useful to read it together with A Grief Observed^[2], . . . [Readmore]

[2] A Grief Observed is a collection of C. S. Lewis's reflections on the experience of bereavement following the death of his wife, Joy Davidman, in 1960. The book was first published in 1961 under the pseudonym N.W. Clerk as Lewis wished to avoid identification as the author. Though republished in 1963 after his death under his own name, the text still refers to his wife as “H” (her first name, which she rarely used, was Helen). . . . [Readmore]