That's a great choice, but he's getting older! Perhaps a smidgen too old to play the role.

maybe

Way too old. Perf5b4ect physical type tho..
Only because they made Spider-Man too young..
And Eddie wasn't a student like Peter, he was an older guy working at the Bugle.
And yeah, maybe if they use him as Venom, a suit slightly enhanced with cgi and let someone else play Eddie.
I still think it could work as Eddie and Venom though.

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I could actually see that. If he can do a good performance I'd say go for it

Agreed.

Obviously at this point I got the idea because of his looks.
He's a bit of a mix between the Animated show Eddie and Comic Eddie.
Still, if Cena takes it seriously, does his research into the character, gets a good acting coach and/or director and I think he could pull it off.
Eddie himself doesn't have to speak much.
Venom should over-act a bit, just a bit, that's just his manic character.

He does look like an Eddie. And he's definately big enough to play Venom. I'd just be worried about wether or not he could actually act it or not.