The honouring of parents by their children is enshrined in the Law.
Exodus 20:12 Honour thy father and thy mother: that thy days may be long upon the land which the LORD thy God giveth thee.
Matthew 15:4 For God commanded, saying, Honour thy father and mother: and, He that curseth father or mother, let him die the death.
Ephesians 6:1 Children, obey your parents in the Lord: for this is right.2 Honour thy father and mother; (which is the first commandment with promise;)
Colossians 3:20 Children, obey your parents in all things: for this is well pleasing unto the Lord.
As far as the elderly in Christ are concerned they are to be treated as fathers and mothers.
1 Timothy 5:1 Rebuke not an elder, but intreat him as a father; and the younger men as brethren; 2 The elder women as mothers; the younger as sisters, with all purity.
In Christ the younger are to submit themselves to the elder.
1 Peter 5:5 Likewise, ye younger, submit yourselves unto the elder. Yea, all of you be subject one to another, and be clothed with humility: for God resisteth the proud, and giveth grace to the humble.
As far as the older people not in Christ are concerned they are to be loved in the same way as everyone else.
Mark 12:31 And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.
Galatians 5:14 For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.
James 2:8 If ye fulfil the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well
This applies also to enemies.
Matthew 5:44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
The elderly are to be honoured by the young.
Romans 13:7 Render therefore to all their dues: tribute to whom tribute is due; custom to whom custom; fear to whom fear; honour to whom honour.
The Christian must do nothing but good to all men and women, regardless of age.
Galatians 6:10 As we have therefore opportunity, let us do good unto all men, especially unto them who are of the household of faith.
If we want an example we have Ruth’s love of her mother-in-law.
Ruth 1:16 ...Ruth said, Intreat me not to leave thee, or to return from following after thee: for whither thou goest, I will go; and where thou lodgest, I will lodge: thy people shall be my people, and thy God my God: 17 Where thou diest, will I die, and there will I be buried: the LORD do so to me, and more also, if ought but death part thee and me.
I hope you have found this helpful.
May God bless you,