I know we have no strict definition for a methuselah, therefore I think it makes sense to consider first only:

- pattern that are empty or a collection of oscillators (inc. still lifes) and spaceships after a certain period of time (to avoid all growth pattern and pathologicals)

--> the time till this is achieved is the life span L.

For measuring the size of the methuselah I suggest MCP (minimum covering polyplet).

Here a start:

MCP=2, L=2:

Code: Select all

`x = 2, y = 2, rule = B2e/S1c`

bo$o!

MCP=3, L=52,521:

Code: Select all

`x = 3, y = 3, rule = B2-a3-any5any67/S2ce3any4any678`

o$bo$2bo!

EDIT1: actual records (credits see below)

MCP=2, L=56:

Code: Select all

`x = 2, y = 1, rule = B2-en5e7e8/S2i3kry4cikt5j6c`

2o!

MCP=3, L=98,975,157:

Code: Select all

`x = 3, y = 3, rule = B2-a3-any5ainy678/S2ce3any4aenyz5kr6-e8`

2bo$bo$o!