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I think an important factor is also how long you had the same number. I switch numbers every couple of years because I get a new contract and moving the number to the new company is such a hassle. Over time you share your number with more and more companies and people who sell it or get breached.

My parents had their number for ~30 years. I never get spam calls or texts. They get one once a week or so (this is in Germany, we get a lot fewer of these calls).

I’ve had the same cell phone number for 25 years across 5 carriers and get maybe 1 spam call a week.

My 86 year old father regularly gets calls from his "grandson" (who does not exist)... who is in jail, and needs help.

FWIW, I am in my 20s and receive many phone calls. But maybe your theory is correct and I am an outlier.