Do elderly people in the spiritual world remain eternally elderly?

Yes so given that there is no destroying effect of time in the spiritual world do babies remain babies eternally and do elderly people remain eternally elderly yes there is a text where he elaborates in the 10th canto from various sources where he describes that in the whole of Vrindavan there is only one old person and that is Pauranamasi Pauranamasi is the elderly like a Brahminical counsellor for the Vrajavasis and Nanda Maharaj they are middle aged now in Bhulok Vrindavan on earth Krishna grows Krishna grows from a small baby upwards upwards and till he comes to the teenage when he leaves Vrindavan and then he always stays youthful even in the material world, he never ages in the spiritual world however Krishna and Radha Rani are eternally of the same age they are now a young one now so Krishna is around 16 and Radha Rani is around 14 and that is their eternal age and the point of the spiritual world is that there is appropriate reciprocation between Krishna and his devotees at all times so different devotees are in different rasas so for Yashodamani for Radha Rani to have Madhuri Ras relationship with Krishna, she has to be in a particular age, Krishna has to be in a particular age so and that is the how that continues eternally so yes, the forms remain the same eternally and that is how the various rasas are eternally reciprocated between Krishna and his devotees.