Oldtimer and Oldster

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

Oldster and oldtimer are semantically related. in older person topic. In some cases you can use "Oldster" instead a noun "Oldtimer", when it comes to topics like senior, someone of advanced years.

Oldster noun - A person of advanced years.

Oldtimer and oldster are semantically related. Sometimes you can replace term "Oldtimer" with "Oldster", this nouns are similar.