[kbrwn]

My experience learning a new keyboard layout was at age 19 an I was not typing for more than a few hours a day.

It takes much longer to both break old habits and form new ones from older ages. If you have been typing for 20+ years in QWERTY and use a keyboard everyday professionally learning a new layout will likely be a very hard and frustrating task. Every time you switch back to QWERTY you are basically reversing the practice you have put in. If you are typing for a profession you likely won't want to suffer months of half your former typing speed or less until you catch up.