Has it always been that way, or just recently?

I guess since the tree is 100 yrs old you have no idea if it is a seedling or a cultivar (most likely just a seedling). The next question would be what kind of maple is it? There are many kinds of maples and they all don't have the beautiful fall colors. Norway and Silver maples come to mind as two with somewhat dull fall color (yellows and browns). The sugar maple is known to have the best fall color (blends of yellow, orange and red), and "red maples" are quite nice also (usually deeper red and less orange with no yellow). But having said that, all trees will vary in color. Especially seedlings, or trees grown from seed as opposed to grafted cultivars often have very different characteristics from one tree to another.

I had a small sugar maple seedling that had fall color just like yours, mostly dull yellow and brown and the leaves stayed on well into winter. I finally removed it and planted a named cultivar (Green mountain) that looks alot better. I don't think the pine has much to do with it.

If you could post a couple photos of the tree and close-ups of the leaves someone could identify it quite readily.