Old person and Oldtimer

Old person noun - An elderly person.

Oldtimer and old person are semantically related In some cases you can replace term "Oldtimer" with "Old person", this terms are similar.

Oldtimer noun - An experienced person who has been through many battles; someone who has given long service.

Old person and oldtimer are semantically related in someone of advanced years topic. Sometimes you can use "Old person" instead a noun "Oldtimer".