We can easily manage if we will only take, each day, the burden appointed to it. But the load will be too heavy for us if we carry yesterday's burden over again today, and then add the burden of the morrow before we are required to bear it.
Never have I enjoyed youth so thoroughly as I have in my old age. In writing Dialogues in Limbo, The Last Puritan, and now all these descriptions of the friends of my youth and the young friends of my middle age, I have drunk the pleasure of life more pure, more joyful than it ever was when mingled with all the hidden anxieties and little annoyances of actual living. Nothing is inherently and invincibly young except spirit. And spirit can enter a human being perhaps better in the quiet of old age and dwell there more undisturbed than in the turmoil of adventure.
The only way to find out if you can write is to set aside a certain period every day and try. Save enough money to give yourself six months to be a full-time writer. Work every day and the pages will pile up.