I've had a 401K since I was 21 (30+ years investing) and put the max in every year following the "normal" investment strategy (balanced mutual funds). And had company matching almost every year as well. This means I invested through the tech boom of the 90's and the recovery of 2008. At one point I left jobs and rolled the 401K into a managed IRA because I didn't have a job for a brief period. Now I have another 401K with another company, but I chose not to roll my original one into the new 401K because my IRA has better investment options.

TL;DR: Start investing as soon as you can, and by "investing" I mean the Warren Buffet way on the diversified mutual fund grid (cap vs valuation), and not this memestock/crypto B.S.