I don't know what the future holds for me, but I trust in God's mercy to see me through anything that may come along, so I am at peace, staying in the 'now'. I know I'm still me, I'm feeling great about life, and that's a pretty good way to be old!
It doesn't have to be long and complicated. Just take out a few minutes every day to clear your head and breath deeply and keep your mind only on your breath. When the mind wanders and starts to plan your day, just bring it back to the breath.