All cars requires proper maintenance that has nothing to do with new or old one. A new model cultus could start giving problems in no time, if not taken care the right way while new one has less chances of problems comparatively with older models.
Your decision to opt new model cultus is a good one , go for it without any hesitation.
Just as an end note, never buy old model car without consultation of a good trustworthy mechanic, dentar and sometimes an electrician as well if you feel issues in wiring.