Yes. This I learned this year.The problem with old machines is that the RAM for them is often no longer made and becomes rarer and more expensive.
I had my 11 years old 64bit PC "upgraded" in the summer to an SSD, better Graphics card and a new power box.
However, the extra 4 gig chip was blagged out one of my guy's black boxes of Antiques Roadshow spares!
I do not know if it helps. but I don't think it'll be worse off. Only cost a 10-er anyhow.
Ended up with pretty much a new PC for about £140.00 including a fresh OS.
Certainly the SSD seems to promote better performance from the old original clattery HD...full boot up time is on average 1m 26 seconds.