I was born in SE20, and since then have lived (in date order) in
SE26
SE3
SE13
SE21
SE13 (again)
SE12
SE22
SE23

that makes 8 SE postcodes - can you beat that?

that is amazing. If you do not mind me asking over how many years. Let face it you can only go up from SE 20.

I can only offer
SE 26
SE 23 2 separate places
Total 59 years

Unless to 2, 5 (parts), 6 (possibly), 8 (back in the day), 9 (they say, if you aren't white, or just have a horror of endless suburbia and white vans), 15 (parts), 17 or 18. And 25 is quite similar.

But - if you are bothered about such things and prepared to make inferences from postcode alone - thenutfield's trajectory is not consistently upwardly mobile, either - like 3 to 13 and 21 back to 13...

43 years.
And hilltopgenerals inference is spot on! the postcodes sort of mirror my life events
3 to 13 - leaving home for the first time
13 to 21 - youngish, dinky (and bits of se21 were cheaper then)
21 back to 13 - woops! d.i.v.o.r.c.e. - nothing like it for reducing one's housing lifestyle!
12 to 22 - getting back on track
22 to 23 - still good, but new family now

i wonder where next - dreams of SE10 and nightmares of SE28!

35 years, 2 houses officially.
SE26 til 81, then SE23 til present.

Nope, I can't top that. Although I've managed 7 residences in the last 8 years several of them were in the same postcode and some of those were (ahem) west of the border.
SE3 -> SW2 -> SW9 -> SW2 -> SE24 -> SE24 -> SE14 -> SE26

Does SW count?

How could SW count when the question is 'Am I Mr SE Lonon?'