Rambo IV - Why the Geriatric Comeback?

I'm ok with old actors working as long as they don't do sex scenes and stuff where they have to show their wrinkly bare assets. I also must comply that many actors and actresses have found a new boost of vitality and creativity and hence have managed to reach success yet again, if not for the first time , in their autumn years, people like Judy Dench, Morgan Freeman and Ian McKellen... But I cant help to think Stallone has seen better days, and by better days I mean: #1 - being a runner up for Best Actor in the Oscars back in 1976. #2 - Cop Land.
So why take a character as likable as the slow thinking, fast striking, speech impediment enforcing John Rambo, now a retired killing machine, and make him go through hell all over again? Well, I don't have the answer to that unusually long question, but I do have the trailer of this Rambo IV for you guys to see; and if my eyes don't fool me I believe this is gonna be a Sunday of Grumpy Old Men's back problems and refusal to take their medicine with Rambo's sweaty men in jungle suits covered by a topping of Starship Troopers exploding bodies and excessive usage of fake blood with a cherry on top.
If this doesn't make sense to you, try to read this very slowly after watching the trailer.