Tax issues

I didn't understand this as a tax issue. You seemed to be asking if you could lose your residence status:  I would like to know if I can stay outside of France for a longer period than 6 months without loosing my status as a resident concerning the Administration.

SOMEBODY is going to want the tax on your pension. For many people that would depend upon where they live and what any treaty between that country and France has to say about it. For example, under the US-France tax treaty, the PAYING country (France) gets the tax. With other countrie it might be the country of residence. (There would also be a question of liability for social taxes on the pension if one were residing outside France.)

Tax specialists I know seem to agree everybody has one tax domicile and that may be decided by the set of tiebreaking rules in the treaty when there are multiple residences or, in the end, by a joint committee.