people with a 15 life lesson:

Isaac Asimov

born January 2nd, 1920

1 + 2 +1+9+2+0 = 15 = his life lesson = what he was here to learn = Resisting temptations.  Self-promotion.  Marketing.  Advertising.  Commercials.  Ads.  Sponsorship.  Endorsements.  Branding.  Packaging.  Sales pitch.  Sales.  Buying & selling.  Commerce.  Commodity.  Products.  Merchandise.  Items.  Merchant.  Salesperson.  Retail.  Vendor.  Cost.  Profit.  On commission.  Auctions.  Bidding.  Trading.  Swap.  Bartering.  Exchanges.  Transaction.  Money.  Spending.  Receipt.  Taxing.  Tariff.  Fees.  Secular.  Wants.  Desires.  Sense pleasure.
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David Niven
born March 1st, 1910                         3 + 1 +1+9+1+0 = 15
Lucy Li
born October 1st, 2002                    10 + 1 +2+0+0+2 = 15
Sophia Flörsch

born December 1st, 2000                12 + 1 +2+0+0+0 = 15

Emily Alyn Lind

born May 6th, 2002                            5 + 6 +2+0+0+2 = 15

Supa Peach

born March 7th, 2003                         3 + 7 +2+0+0+3 = 15