Yes, happened to me too several times, i have sometimes accepted a friend request, but usually ended up blocking them, one even rang me on messenger which you can do and its free, he said he preferred older women, in the end i blocked him, another in the army in Afghanistan ,actually asked me if i would receive a parcel for him and save it until he went home, [i assume on leave] i blocked him immediately,
Afriend of mine in her 60s, got involved with someone, they met a few times, and they were going to get married etc, she lent him a large amount of money, and her car, she never saw him ,her money or her car again,
The police found him in the end, but although i told her she was being stuip to be taken in she didnt listen because she was so smitten with him,
Lesson learned the hard way
When i was younger 40s, i got involced with someone quite a bit younger than me, my family objected and i finished it, we had been seeing each other for about 2 years, he was lovely and treated me like a queen, but i wouldnt take notice of anyone again, not even family
Feacebook is full of scammers, and con men