Instead of going all out, you should first educate your wife about trans people, on what they go through, all the things.
I suggest you show her this video https://www.youtube.com/watch?v=UIUQJN1B0aQ
It's great as it has indian context.
try to get her honest thoughts out of it, see her reaction,
and find a good timing to tell her about yourself.
No, there isn't anything as too late for transition...
It's you, and nobody can stop you from being you, it's never late to be you. Always keep this in mind
Don't expect to understand all of this quickly, some time is needed to understand,
so give her time, don't pressurize her, try to shed as much as light about this topic
Then you can go attend a trans-friendly psychiatrist, he will help you out!
I suggest be perfectly sure on what you want, then start transitioning,
Cause it is irreversible thing, don't rush up things. Try to educate yourself more, find information on internet, there are lots of sub-reddits, like /r/asktransgender...get more knowledge on it.
the more you know, the better !
take your own time, at your own pace!
and don't worry about your body looking less feminine, HRT does wonders, it's a magic !
Keep us inform !
I wish you best of luck !
and don't forget,
it's never late, to be you, to be yourself,
don't let the society decide your life, it's your life, you should live it !