There are 50 words. At that time I was using an Electrum version that is years old now. Maybe around 2012? Definitely nothing newer, as I had cut bitcoin out of my life for a few years until I came across it again not so long ago. Between 2014 and 2015 I was busy with altcoins. From 2015 onwards, I completely took care of my life, my job and forgot about that kind of stuff because I only found out about it through friends anyway and only half understood it for myself, my view of Bitcoin wasn't that strong for a long time and I didn't fully understand it yet. It was all pretty messy.
In that case, it's possible your seed phrase was generated using old version of Electrum's seed phrase which use 1626 english words rather than 2048 english words. You can visit
https://github.com/spesmilo/electrum/blob/5883aaf8ca2f79bf694d11ac6b63f5defd2a2c38/client/mnemonic.py#L23-L1650 and check whether all of your 50 words exist on that list, in order to narrow down.