Yes, though some of them already had a proclivity when they were young, it's gotten worse.

Sometimes getting them a prepaid phone with limited minutes, like 100/month or 1000/year, manages to fix it because it stops them from answering calls from unrecognized numbers. I guess the logic is they get upset about spending 4 cents a minute.

Oh hell yeah. My elderly mother started buying anything pitched to her before I jumped in and spent six months undoing that damage.