How common is your name in Finland?
I was poking around Peter Gagarin's website
and noticed his entry about an M35 race in Hungary in 1983
, a spectator event on the map of the 1983 WOC individual races (what would be called Long now, but back then there was only one individual race and and one relay race for each gender at WOC).
If you scroll down that page to the bottom, you'll see the results. Peter won, and 3rd place was "J. Salmenkylä (FIN)". To be in M35 in 1983, he would have been born in the mid 1940s.
So I Google'd for orienteers / suunnistayat named Salmenkylä, and of course your name popped up a few times, but so did a fellow named Juhani Salmenkylä
). He actually would have been a bit old for M35 in 1983, he was born in 1932, so maybe it's a different person, or maybe he ran in the younger category because he was pretty fast for his day (on the silver medal relay team at the very first WOC).
I found another article that says Juhani and his brother Matti started the original iltarastit
in 1977. (For any non-Finnish-speaking readers, "iltarastit" literally means "evening controls", and refers to low-key evening orienteering events that happen pretty much every summer day in the Helsinki area and quite a few in other parts of Finland too. If you put "iltarastit" into Google Translate, you'll get something like "evening checkers" which I think is Google's mangled way of trying to say "evening checkpoints".)
So, you don't by any chance have a grandfather or great uncle or older cousin named Juhani or Matti, do you?