@Tucson, I am 59 (have a big birthday coming later this year) and 5'8". I am not confident that I know what my base calories are and I am not confident in exercise calories over and above that. So I am guessing very conservatively on both. I will only change that once I see definite movement toward a lower weight. I am pretty sure I will see that soon. Yesterday I tied my lowest weigh in and I am fairly sure it wasn't a low spike. Then I will work on getting exercise calories right, or at least close to right. Only when I do that can I hope to figure out my base. When it warms up it will be especially tough to track exercise. I go fishing on my kayak or (starting this year) my paddleboard. Sometimes I might go on a float trip where we drift down a river, other times I might go to a lake or the sound and maybe fish right by where we put in or maybe paddle a lot to get to the spot or try different spots or troll... I could end up paddling lazily for a few minutes here and there and I could paddle hard for hours.

EDIT - as of now, my watch says 16476, 7.37 miles,668 calories in 155 minutes. Minutes are always screwy because some of those steps are just normal walking around slow with stopping. The bulk of it was 3+ mph brisk walking.