The premiership defender will play his 265th game on Sunday at home against North Melbourne, breaking the mark that has stood since 1998.
Stynes is one of the great Irish and Australian sporting stories, debuting for Melbourne in 1987 and winning the 1991 Brownlow Medal.
The revered ruckman's streak of 244 consecutive games remains an AFL record.
Stynes became Melbourne president and was crucial in the club emerging from years of financial struggle.
He also co-founded the The Reach Foundation, a youth charity, and was given a Victorian state funeral after dying of cancer in 2012, aged just 45.
"It's a strange one. I'm obviously proud I've been able to play as long as I have," Tuohy said on Monday.
"(But) he's everyone's hero. You almost feel guilty playing more games than him.
"It's probably mostly because I don't feel I belong in Jim's category as a player and obviously in terms of legacy, so it's a strange one.
"I don't really know how to feel."
Tuohy debuted for Carlton in 2011 and started playing for Geelong six years later.
He was a key member of the Cats' premiership team last year and is renowned for his booming kicks out of defence.
Tuohy said as more Irish players try AFL careers, Stynes' legend grows in his native country.
"I knew of Jim Stynes, obviously. I don't think I appreciated the significant impact he had on the game or his legacy post-career," he said.
"I only got to appreciate that when I came out (to Australia).
"The good thing is, with more and more Irish guys and girls coming out, his legacy is getting much more publicity back home.
"I must admit, I was blown away to see how significant a character he was."
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