Brown, who has moved back to his family home near London after leaving Newcastle Falcons, was already preparing for life after rugby last year when he became part of a player management division (agent) for the private platform Premier Sports Network last year.
The former England full-back is also now studying for a masters in sporting directorship in Manchester, and hasn't ruled out swapping sports.
Brown had an incredible career, representing England 72 times between 2007 and 2019. He is the only Englishmen to win the Six Nations player of the tournament award (2014).
Many of those caps came alongside close friend Care, who has been paying tribute to the fullback.
"Mike Brown was one of the main reasons I joined Harlequins all those years ago," said the scrum-half when Brown left the Stoop.
"We played together for England at the Under 21 World Cup in France and that was where it all started. We’ve grown up together,
"I’ve never met a more professional rugby player. For me, he’s the ultimate example for any young lad coming through,"
DID YOU KNOW? Brown married long term partner, fashion designer Eliza Scarlett Woodcock, the daughter of former England international footballer Tony Woodcock, in summer 2016
The England XV Mike Brown selected for the 2023 World Cup
Former England fullback Mike Brown attempted to predict the XV that will take to the field in the first game of the 2023 Rugby World Cup back in January 2021.
BACK-THREE:
15. Tom de Glanville (Bath RFC)
14. Anthony Watson (England)
13. Jack Nowell (Exeter Chiefs)
BROWN SAID: "De Glanville has all the skills. Get him in now to see if he can make the step up."
BROWN SAID: "Slade has got the natural ability that we associate with All Blacks. Farrell showed against Wales what he can do as second receiver, bringing outside backs into the game and off-loading when taking the line on himself."
RUCK'S PICKS: 13. Joe Marchant (Harlequins), 12. Owen Farrell (Saracens)
HALFBACKS:
10.Marcus Smith (Harlequins)
9. Dan Robson (Wasps)
BROWN SAID: "Smith will provide a genuine, high-level kick, pass and run threat. Ben Youngs isn’t getting any younger and his understudy Robson could add spark to the attack."
FRONT-ROW:
1. Mako Vunipola (Saracens)
2. Jamie George (Saracens)
3, Kyle Sinckler (Bristol Bears)
BROWN SAID: "Ellis Genge hasn’t quite done enough in his limited opportunities to move ahead."
"It's a really sad situation.
"What we're going to miss, @FalconsRugby are going to gain. They've got a real good one in Mike Brown."
Danny Care offered his thoughts on the impending departure of Harlequins’ all-time appearance record holder.