Tranny not shifting good

[oic0]

My truck has a Mazda R-1 5 speed manual tranny in it. It used to shift great and was always happy to speed shift. Lately though it dosent always want to get into first or second gear and when I speed shift it (takes some effort to pass with a 4 banger truck) it sometimes dosent get into the gear and makes a nice grinding noise. It has new fluid in it. Think its just because it has 120k miles on it? The motor still runs like the when it was new except for a bit of power loss from a bad vapor canister tripping the computer. Think it could be the clutch maybe? I checked its level and filled it up.