Growing older has its pluses and minuses. Overall it seems like I have a much better perspective on life and more comfortable take on how to live and meet new challenges, though that doesn't mean I always do well in this in real life. I seem to be much more settled in my faith, while at the same time acknowledging that on a good number of issues I really have less certainty than I did in the past. But along with that a stronger dependence on God and interdependence on others especially those in Jesus.
Of course there is the downside. Losing the hair I used to like pretty well. Once in a while having a bad back. Seeing myself look my age, at least in my eyes (51). And realizing my days are more and more numbered.
This all reminds me of Moses' prayer in Psalm 90: "Teach us to number our days, that we may gain a heart of wisdom." Every day I see as a gift from God. I try more and more to use these days wisely. They are gifts and we're stewards of them. So I think I waste less time each day than I used to, at least in quality if not quantity. Though I still do waste plenty of time daily, I 'm sure- or at least water it down. Of course we should enjoy life and the good things God has given us. But at the same time, we need to live our lives with a sense of urgency and mission in Jesus. We want in Jesus to be faithful and really meet issues in our lives in a way which glorifies God in Christ. We want to be all that God would have us to be in this life in Jesus.
Oak trees, or as Isaiah says, "mighty oaks" do not grow overnight. It takes time and years. Of course we can't count on that time, but we're called to simply be those who are on that track of growth regardless of how long our time here will be.
One thing I'd tell any young person right now: Enjoy life, but don't live as if this day doesn't matter. It does before God. In Christ God wants us to see every day as a new event, even adventure, everything, including the seeming mundane, really mattering in God's eyes, so that it should in our own as well.
May we be those who are not only growing older, but growing towards maturity in Christ- really growing up in him.