Doing a PhD:
"You may well be 10 years behind your peers financially, which may not seem important at age 22 but it will be at age 32"
Very true. And you might never be able to close this gap (except maybe in the US and some top EU places).
If students tell me they want to get a PhD, I will support them and write them a letter. But I also tell them, because no one told me at age 21-22:
-- You will spend your twenties making poverty wages while your peers start getting salaries, raises, bonuses, etc.;
-- You may well get into credit card debt paying your bills as a result, especially if you are doing grad school in an expensive city;
-- If you get a faculty job, your salary will likely not be much more than what some of your peers got upon graduating undergrad;
-- You may well be 10 years behind your peers financially, which may not seem important at age 22 but it will be at age 32
I get that people say "but it's not about the money, it's about passion!" I thought that too. But this stuff matters a ton and students need to be aware of it.