http://www.rihey.cc/MP4-Players/20-20GB-MP4-Player/MP4-Players-20-200GB-JXD950.htm
4.0 inch 16: 9 wide screen and 20GB hard disk
AV out function and long distance infrared control

http://www.rihey.cc/MP4-Players/MP4-2GB-player/MP4-Players-2GB-RM750.htm
2.8 inch QVGA Screen, 320*240 Pixels 2 GB Memory (Extendable Mini SD card) Stainless Steel Body ,Support file folder play and browse

http://www.rihey.cc/MP4-Players/MP4-2GB-player/MP4-Players-2GB-Onda-VX858LE.htm

2.8-inch 320 x 240 TFT touch screen (QVGA)
Play Mp3 and Read e book at same time
Super FM radio, you can preset 20 channels


i think these mp4 players might benefit an elderly user

or else
there is also a 7" big one
http://www.rihey.cc/Portable-DVD/RPDVD-70-Portable-DVD.htm

but the weight is 1.3KG too heavy to Old people