There’s no expiration date on starting. The only real deadline is the day you stop showing up.

Age limits on beginning things are mostly invented, and they get enforced by the person who believes them. What actually ends a possibility is not a birthday but the decision to stop turning up for it. As long as you keep arriving, the thing remains open.

If something has been sitting in the maybe pile for years, do the smallest first action this week rather than deciding whether it is too late. Put the next session on the calendar before you finish the first. Continuing is the whole skill, and starting is just the entry fee.