Do yellow lentils sprout after submersion for a few hours? Yellow lentils. Not consumed fast enough. Organic. Bought bulk at a health food store 28-29 months ago and kept in a sealed jar.

After leaving them in water for 3-4 hours, they seem to be sprouting. Is that possible, so fast?

One concern is that the sprouting tips appear to be breaking off. Is that a sign that storage for nearly 30 months is excessive and the jar should be discarded?

Worst case scenario: the minuscule tips that appear to have broken off are entirely static (they do not move). Could these conceivably be (dead) worms?

Another thought: my indoor potted plants seem to blossom quite happily in April. It's as if they know it's Spring, despite being in constant temperature year round. Do lentils also sprout more eagerly in Spring than in Fall/Autumn?

(Note to self: must eat grains and lentils more regularly.)
First off, no they are almost certainly not dead worms. 

What you are looking at inside the lentil seed is the embryo of the future lentil plant. Soaking makes the whole seed expand as it takes up the water, and sometimes the two halves of the seed come apart so you can see these little plant embryos better. But they are contained in the seeds all the time, even before you start soaking them. When you eat peanuts (also legume seeds, just like lentils are), if you look at the inside of a split open one, you can see the embryonic plant really well because they are so big. 

Maybe technically speaking, your lentils are sprouting in some microscopic way from the moment they hit the soaking water, but usually when people say "sprouting", they are talking about when the little root of the plant has started to develop and starts poking out of the seed in a visible way. This wouldn't happen in just 3-4 hours. Maybe at the very least a couple days. 

As far as the age of your lentils, 30 months isn't too long at all as far as edibility goes (as long as you kept them dry and in decent conditions), so don't throw them out. If you bought them intending them exclusively for sprouts, sorry, I don't know whether 30 months is long enough to diminish their "sproutability" significantly. But I'd be surprised if at least some of them wouldn't start to sprout after a few days.

Also, sorry I can't answer about sprouting more readily depending on the season. Certainly beans will sprout all times of the year, but maybe someone with more experience can say if they do it quicker in the spring or not.