Yes. Averagely life insurance agents will earn 5k a month after 3 years in the business. (With hard work and be a good follower)

Let's do the maths:
For every investment-linked plan sold, an agent earns 20% basic commission. (Very transparent, because nowadays commission disclosure is provided in quotation)

Average commission breakdown over 6years:
Year 1: 20%, Y2: 20%, Y3: 13.5%, Y4: 18%, Y5: 15%, Y6; 15%

So, if customer A bought an insurance plan of $200 premium monthly.
$200 x 12mths x 20%=$480yearly commission
Assuming 4cases closed a month, in a year
48cases x $200 premium x12mths x 20%=$23,040yearly commission.

If consistently perform as this level, after 3 years...
Year 1 =$23,040
Year 2 =$23,040 + $23,040 (Y1)
Year 3 =$23,040 + $23,040 (Y2) +$15,552 (Y1)

Hope this info helps. And of course, it involves hard work, as you are doing your own business.