Unless I misread the date of death on his Death Notice, I believe the death year of 1838 is wrong and should read 1858.
The relevant information:
Nicolaas Lourens Botes - Nicolaas Lourens Botes, c3d4
Death Notice - https://familysearch.org/ark:/61903/3:1:3Q9M-CSQF-CSWB-H?mode=g&...
D.O.B and baptism - * dist. Beaufort-Wes 26.1.1796 ≈ 12.6.1798
Age on DN 62 years
DOB of last child e15 Johannes Petrus * 23.4.1857 ≈ Prins Albert 5.7.1857