PSA for my fellow olds (over 30): Do not, at any point, put a wheel between your feet and the ground unless you've been doing it consistently since you were a kid. You WILL fall, and you WILL break bones. Your opportunity to take up rollerblading, skateboarding, etc. as a hobby has passed. Accept it and move on.
But for real, balancing is a skill that needs to be practised and regular exercise to strengthen your stabilising muscles is important to stay mobile in actual old age.