By the time you’re 50-60, either of those may no longer be the case. Either your kids may be old enough to provide for themselves (i.e. out of college), and/or you may already have enough money in your various savings accounts to handle whatever needs they have. That second one seems especially likely given that you’re 22 and already focused on making good financial decisions.
2. Term life insurance WILL cover funeral expenses, but only for as long as it is in place. Whereas whole life insurance does not expire and could therefore cover those costs indefinitely. But in most cases it’s more prudent to simply build up your general savings, which could then be used for anything, including funeral expenses, and only keep the insurance around as long as you really need it. It’s not an incredibly cost efficient way to pay for final expenses.
Any reputable source will report mutual fund and stock returns as “annualized” figures, which takes the sequence of returns into account. Another term for this is “geometric average”, which again accounts for the order in which returns are received. So while there are some financial “experts” out there touting average returns (cough, Dave Ramsey), for the most part what you’re talking about here is not a factor.

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