I don't think that's Solid Snake in MGS4.

[Kayanator]

leo-j said:
Wha if thats snake's father!!!

 Big Boss IS Snakes father -Or at least he was cloned from Big Boss.

And infected with a disease, I didn't hear that? I know FOXDIE will be unleashed on the battlefield but others including Meryl have been infected by it and they don't look old.