Raidens age is unknown
You cant get a sword in MGS3
The HF blade
You cannot keep the sword, you can only use it in the end of the game.
If you mean story wise then I believe it goes: Metal Gear Solid 3: Snake Eater Metal Gear Metal Gear 2: Solid Snake Metal Gear Solid Metal Gear Solid 2 Metal Gear Solid 4 But I may be wrong, and that isn't counting either of the Portable Ops games.
metal gear solid1, metal gear solid 2 sons of liberty, metal gear solid 3 snake eater, and metal gear solid 4 guns of the patriots.
Metal Gear Solid, Metal Gear Solid 2: Sons of Liberty and Metal Gear Solid 3: Snake Eater
Metal Gear Solid happened in 1998.
Metal Gear Solid 4: Guns of the Patriots
The best Metal Gear Solid game is what you define as 'best'. Personally, I think Metal Gear Solid 4: Guns of the Patriots is the best Metal Gear Solid game, it is also the highest rated Metal Gear Solid game ever to be developed and published.
{| ! colspan="2" | Title ! Setting ! Protagonist | Metal Gear Solid 3: Snake Eater 1964 Naked Snake (Big Boss) Metal Gear Solid: Portable Ops 1970 Metal Gear Solid: Peace Walker[8] 1974 Metal Gear 1995 Solid Snake Metal Gear 2: Solid Snake 1999 Metal Gear Solid (also The Twin Snakes) 2005 Metal Gear Solid 2: Sons of Liberty Tanker Chapter 2007 Plant Chapter 2009 Raiden Metal Gear Solid 4: Guns of the Patriots 2014 Solid Snake (Old Snake) Metal Gear Solid: Rising (Unknown) Raiden |}
metal gear solid 2