I've seen a lot of colleagues develop health issues as they age so I'd suggest spending a bit on ergonomics (e.g. a better chair, desk, or monitor) to keep thin

I've seen a lot of colleagues develop health issues as they age so I'd suggest spending a bit on ergonomics (e.g. a better chair, desk, or monitor) to keep things like RSI and eyestrain from creeping up on you later in life and also spending a bit on things that help maintain and monitor your health (sonic toothbrush, exercise gear of your choice, blood pressure meter, etc.).