Earlier today, I was riding past Spy Pond in a bus when I saw what I think were two young bald eagles perched in the trees along the shore. I didn't get a great look because the bus was moving (of all the times to *not* have a traffic jam!), but it looked like one had an all/mostly brown head, and the other had some "splotches" of white around the head and upper chest.
Last month, I went on a wildlife-oriented Boston Harbor cruise. One of the highlights was a juvenile bald eagle (no white on the head that I could see) near Logan Airport.
And also last month, a friend of mine saw a young eagle (some mottled white on the head) on the iced-over Charles River in Cambridge.
Adult bald eagles are some of the most majestic birds in the country, but it's also great to see so many youngsters in the area. Hopefully that speaks to a healthy regional population.