We gave on eto my 80 year old dad a christmas (1st one from Maplins we had to return as it didnt work, got a better one at cheaper price from Ebay came from Hong Kong and was brill)
He loves it and had now 3 memory cards with different sets of photos on them,
1 with old black and whites of him as a child through to joining the RAF, to getting married to Mom, to us all being born, to us growing up.
2 is of us all since youngest brother left home for Uni, (there are 5 of us kids) all our marriages and through to the Grandchildren being born.
3 all the most recent ones, whichis updated regularly when he comes to my house, family email photos to me and I then add them to his memory card.
We split them up into 3 cards (£5.00 each off ebay) as he found it took too long to get through them all on one card, (not sure they would have fitted on them anyway)
He says he can then sit and watch which ever era he feels like.