Without trying to pinpoint who exactly he is, I will just bring up some characteristics.
A symbolic old man might personify experience, wisdom, shrewdness based on experience, sometimes a calm that comes from being jaded by seeing too much hype. He didn't have wrinkles, so he had gained the respect without too much weathering.
Christians sometimes see purple in visions of the Holy Spirit. But purple is also seen as a playful color, sometimes mystical and tending more to act emotionally than through rote memorization and legalistic obedience. Purple is not a color for business shirts, but for informal social gatherings... expression of personality.
White can mean purity, but also change (dare we say the word again!).
He communicated with you directly, but did not come close. Think about whether that felt stand-offish, or like he was too holy/respectable to stand near you, or that there were no obstacles to your hearing far away, or that he was in a hurry...
Short hair can imply a few things. Hair can represent his level of authority, or the protection surrounding him, or the way he presents himself publicly. Short hair might be a sign of controlled, concise, tasteful and self-restrained authority. Compared to someone who might overdo the hair thing, like Zaphod Beeblebrox in Hitchhiker's Guide. Self-promotion vs. professionalism.
The fully white room could be ethereal, but could also show that everything has transitioned so much, that you can't get a handle on anything familiar. You were placed in a completely unfamiliar zone.
And someone communicated things to you, making you feel like they paid attention, but did not communicate enough for you to know what to do next, or understand what was going on. You might have walked away feeling a little guilty that you didn't get it, when in reality it was intended to leave you in the smoke.