GG,
I feel like you have the right instincts, wanting to be able to go and do stuff while you're still physically and mentally able. Don't fall into the "just one more year" trap--where, "sure, just one more year, and I'll have
enough." That year never comes.
When it becomes just accumulating more wealth, it's time to take a hard look at, "why am I still doing this, and not doing things I enjoy?"
Of course, some people legit love their jobs, so good on you if that's the case. But, don't work so long that you can't enjoy life (or enjoy it at a significantly reduced level) just because, "well, that's what society expects of me."
Here's a podcast on the subject of retirement planning I listen to. Really like their philosophy.