I'm 65, and will be receiving mammary feminization (yes, that is what the provider is calling it!), or Breast Augmentation (BA) in a couple of months. I'm a small 34B, and will be adding an estimated 275-300 cc in each side, under muscle. The surgeon will determine what size works best.
I fully expect to have this 'unnatural' tight appearance for a while as things settle down and tissue swelling slowly goes down. I am OK with this.
I expect to look 'unnatural' for my age afterward, as unlike many cisgender women my age, I do not expect the twins to be swaying down at my beltline. I am also OK with this. I am quite certain my girlfriend is OK with this.

The goal is to feel right, feel comfortable in my body, to be able to dress as I want to dress, to don a swimsuit and be stared at for all the right reasons.
Yeah, eventually I will be the most rock-solid looking woman in the memory care unit. I'm OK with that, too. Eventually. Meanwhile I get to be me, whole and complete.