I'm 29 now and I feel so old... I feel like it's already too late to get really fit (I'm skinnyfat) or change careers. Despite having a bit interest in machine

I'm 29 now and I feel so old... I feel like it's already too late to get really fit (I'm skinnyfat) or change careers. Despite having a bit interest in machine learning, I don't have the time or skills to keep improving and I'm stuck in mediocrity. Then I come here and read all these 25 year olds that beat me on every single metric I could conceive,